6440791896 has 128 divisors (see below), whose sum is σ = 22305830400. Its totient is φ = 1672928640.

The previous prime is 6440791883. The next prime is 6440791997. The reversal of 6440791896 is 6981970446.

6440791896 is a `hidden beast` number, since 64 + 407 + 91 + 8 + 96 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 176995 + ... + 210258.

It is an arithmetic number, because the mean of its divisors is an integer number (174264300).

Almost surely, 2^6440791896 is an apocalyptic number.

6440791896 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

It is an amenable number.

6440791896 is an abundant number, since it is smaller than the sum of its proper divisors (15865038504).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6440791896 is a wasteful number, since it uses less digits than its factorization.

6440791896 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 387286 (or 387276 counting only the distinct ones).

The product of its (nonzero) digits is 2612736, while the sum is 54.

The square root of 6440791896 is about 80254.5443946946. The cubic root of 6440791896 is about 1860.5717493088.

The spelling of 6440791896 in words is "six billion, four hundred forty million, seven hundred ninety-one thousand, eight hundred ninety-six".